Proof of Noah's Stair Climbing Ability

On Tuesday, I wrote about Joy's surprise at finding Noah in the bathroom since he had to conquer the mountain of stairs to get there. Since then he's been a stair-climbing fool, as evidenced by this video from yesterday:

Notice Sam applauding when Noah attains the summit. He may be clapping now, but since he can't easily move his toys to another level and away from Noah anymore, we'll see how excited he remains.